// 服务器
let net = require('net');
let assert = require('assert');

let db = require('./db');

let io = {};

let buffer = '';
let queue = [];

let server = net.createServer();

server.on('connection', function (socket) {
    let client = socket.remoteAddress;
    console.log('客户端：' + client);
    //socket.setEncoding('hex');

    socket.on('data', function (data) {

        //截取
        let pattern = /06104001/;
        let data_s = data.toString('hex');
        let pos = data_s.search(pattern);
        if (pos != -1) {
            data_s = data_s.slice(pos, pos + 11 * 2);
        }
        //转换到buffer
        let d = Buffer.from(data_s, 'hex');
        let crc = crc16(d);
        //console.log(d.toString('hex'));        

        let crc_ok = (d[d.length - 2] == crc[0]) && (d[d.length - 1] == crc[1]);
        if (crc_ok && d.length > 8) {

            let value = d[7] << 8 | d[8];
            let is_data = false;

            //压入队列
            if (queue.length > 200) {
                queue.shift();
            }
            // 区分客户    
            let name = 'None';

            if (client === '192.168.10.221') {
                name = 'Line_1';
                value /= 10;
                is_data = true;
            }
            if (client === '192.168.10.222') {
                name = 'Line_2';
                value /= 10;
                is_data = true;
            }
            if (client === '192.168.10.223') {
                name = 'Line_3';
                is_data = true;
            }

            let dt = Date();
            queue.push({ 'nm': name, 'p': value / 10, 'dt': dt });


            //console.log(queue.toString());
            if (is_data) {
                io.emit('pressure', { 'nm': name, 'p': value, 'dt': dt });
                //console.log(client + "：" + d.toString('hex') + '，压力：' + value + '，' + Date());

                // 存入数据表
                db.add_record_pressure(value, dt, name);
            }
        }
    });

    socket.on("end", function (data) {
        console.log("end:" + buffer.toString('hex'));
    });

    socket.on("error", function (error) {
        console.log("socket 错误: " + error);
    });

});

server.on('error', function (err) {
    console.log('tcp error: ' + err);
});

//let uri_server = '127.0.0.1';
let uri_server = '192.168.10.100';
server.listen(9000, uri_server, function () {
    console.log('TCP服务：port 9000');
});

function crc16(data) {
    //crc表
    let crc_table = [
        0x0000, 0xC0C1, 0xC181, 0x0140, 0xC301, 0x03C0, 0x0280, 0xC241,
        0xC601, 0x06C0, 0x0780, 0xC741, 0x0500, 0xC5C1, 0xC481, 0x0440,
        0xCC01, 0x0CC0, 0x0D80, 0xCD41, 0x0F00, 0xCFC1, 0xCE81, 0x0E40,
        0x0A00, 0xCAC1, 0xCB81, 0x0B40, 0xC901, 0x09C0, 0x0880, 0xC841,
        0xD801, 0x18C0, 0x1980, 0xD941, 0x1B00, 0xDBC1, 0xDA81, 0x1A40,
        0x1E00, 0xDEC1, 0xDF81, 0x1F40, 0xDD01, 0x1DC0, 0x1C80, 0xDC41,
        0x1400, 0xD4C1, 0xD581, 0x1540, 0xD701, 0x17C0, 0x1680, 0xD641,
        0xD201, 0x12C0, 0x1380, 0xD341, 0x1100, 0xD1C1, 0xD081, 0x1040,
        0xF001, 0x30C0, 0x3180, 0xF141, 0x3300, 0xF3C1, 0xF281, 0x3240,
        0x3600, 0xF6C1, 0xF781, 0x3740, 0xF501, 0x35C0, 0x3480, 0xF441,
        0x3C00, 0xFCC1, 0xFD81, 0x3D40, 0xFF01, 0x3FC0, 0x3E80, 0xFE41,
        0xFA01, 0x3AC0, 0x3B80, 0xFB41, 0x3900, 0xF9C1, 0xF881, 0x3840,
        0x2800, 0xE8C1, 0xE981, 0x2940, 0xEB01, 0x2BC0, 0x2A80, 0xEA41,
        0xEE01, 0x2EC0, 0x2F80, 0xEF41, 0x2D00, 0xEDC1, 0xEC81, 0x2C40,
        0xE401, 0x24C0, 0x2580, 0xE541, 0x2700, 0xE7C1, 0xE681, 0x2640,
        0x2200, 0xE2C1, 0xE381, 0x2340, 0xE101, 0x21C0, 0x2080, 0xE041,
        0xA001, 0x60C0, 0x6180, 0xA141, 0x6300, 0xA3C1, 0xA281, 0x6240,
        0x6600, 0xA6C1, 0xA781, 0x6740, 0xA501, 0x65C0, 0x6480, 0xA441,
        0x6C00, 0xACC1, 0xAD81, 0x6D40, 0xAF01, 0x6FC0, 0x6E80, 0xAE41,
        0xAA01, 0x6AC0, 0x6B80, 0xAB41, 0x6900, 0xA9C1, 0xA881, 0x6840,
        0x7800, 0xB8C1, 0xB981, 0x7940, 0xBB01, 0x7BC0, 0x7A80, 0xBA41,
        0xBE01, 0x7EC0, 0x7F80, 0xBF41, 0x7D00, 0xBDC1, 0xBC81, 0x7C40,
        0xB401, 0x74C0, 0x7580, 0xB541, 0x7700, 0xB7C1, 0xB681, 0x7640,
        0x7200, 0xB2C1, 0xB381, 0x7340, 0xB101, 0x71C0, 0x7080, 0xB041,
        0x5000, 0x90C1, 0x9181, 0x5140, 0x9301, 0x53C0, 0x5280, 0x9241,
        0x9601, 0x56C0, 0x5780, 0x9741, 0x5500, 0x95C1, 0x9481, 0x5440,
        0x9C01, 0x5CC0, 0x5D80, 0x9D41, 0x5F00, 0x9FC1, 0x9E81, 0x5E40,
        0x5A00, 0x9AC1, 0x9B81, 0x5B40, 0x9901, 0x59C0, 0x5880, 0x9841,
        0x8801, 0x48C0, 0x4980, 0x8941, 0x4B00, 0x8BC1, 0x8A81, 0x4A40,
        0x4E00, 0x8EC1, 0x8F81, 0x4F40, 0x8D01, 0x4DC0, 0x4C80, 0x8C41,
        0x4400, 0x84C1, 0x8581, 0x4540, 0x8701, 0x47C0, 0x4680, 0x8641,
        0x8201, 0x42C0, 0x4380, 0x8341, 0x4100, 0x81C1, 0x8081, 0x4040

    ]
    assert(typeof (data) != 'obj', 'crc 计算，参数需要obj');
    //console.log('数据：' + data.toString('hex'));
    let crc = 0xFFFF;
    let idx = 0;

    for (let i = 0; i < data.length - 2; i++) {
        idx = (crc ^ data[i]) & 0xFF;  //^ & 运算符优先级
        crc >>>= 8;  // 算术右移
        crc ^= crc_table[idx];
    }

    let result = Buffer.alloc(2);

    result[0] = crc & 0xFF;
    result[1] = (crc & 0xFF00) >>> 8;
    //console.log('数据：' + data.toString('hex') + '，crc：' + result.toString('hex'));
    if (result[0] == data[data.length - 2] && result[1] == data[data.length - 1]) {
        // console.log('数据：' + data.toString('hex') + '，crc：' + result.toString('hex'));
    }
    return result;
}

// socket io
server.set_socketio = function (socket_io) {
    io = socket_io;
}

// 返回历史数据
server.get_data = function () {
    return queue;
}



module.exports = server;
